Complete uninstall and reinstall

I’m having problems with scanning media.

I think that it’s something to do with a previous install. Can anyone please talk me through doing a complete uninstall of Kodi as I’d like to dos fresh, clean install of Kodi 17.

I am using an Acer Aspire Revo 3600 with an Intel 1.6HGz processor. GPU 230 @ 1.60GHz
Nvidia Graphics: 3.3.0 NVIDIA 304.135
Kodi Build: Kodi 17.1 Git: 20170320-nogitfound (is this correct?)
Skin: Confluence, I have tried with other skins, same issue.
Complied: Nov 4 2012